Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

4. Protein Structure

Quaternary Structure

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Multiple Choice

Hemoglobin, a four-subunit protein, contains only two different types of subunits and is therefore a:

Dimer.

Heterodimer.

Homotetramer.

Heterotetramer.

Next problem

Verified step by step guidance

Understand the structure of hemoglobin: Hemoglobin is a protein composed of four subunits. These subunits are typically two alpha (α) and two beta (β) chains.

Define the term 'dimer': A dimer is a complex formed by two identical or different subunits. In the case of hemoglobin, it is not a dimer because it consists of four subunits.

Define the term 'heterodimer': A heterodimer consists of two different subunits. Hemoglobin is not a heterodimer because it has four subunits, not two.

Define the term 'homotetramer': A homotetramer is a protein complex made up of four identical subunits. Hemoglobin does not fit this definition because it has two different types of subunits.

Define the term 'heterotetramer': A heterotetramer is a protein complex composed of four subunits where at least one pair of subunits is different. Hemoglobin fits this definition as it has two alpha and two beta subunits, making it a heterotetramer.